This absolute bullshit would also not be possible without millions of suckers who swallow propaganda. From Caitlin Johnstone at medium.com:

So as of right now it’s Trump versus Biden. An incompetent plutocrat president selling himself as an anti-establishment people’s champion while simultaneously advancing garden variety Republican sociopathy, versus a warmongering authoritarian who is too demented to string a coherent sentence together and who is looking more and more credibly to be a rapist.
Needless to say, this is absolute bullshit.
How did we get here? How did we get to the point where the electoral contest to run the most powerful government on the planet is between a racist demented right-wing authoritarian warmongering rapist and another racist demented right-wing authoritarian warmongering rapist? How in the hell did this bullshit happen?
There are a number of factors, including anonymous and unsubstantiated “leaks” from the US intelligence community regarding Russian support for the Bernie Sanders campaign and a shockingly coordinated maneuver by Democratic Party leadership (including former president Obama) to sabotage Sanders in the late hours before Super Tuesday.